In most developing countries, ________
A) birth rates equal death rates, so the population is fairly stable
B) birth rates are lower than death rates, so the population is declining
C) birth rates are lower than death rates, so the population is growing rapidly
D) birth rates are much higher than death rates, so the population is growing rapidly
D
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In an existing population of plants and mycorrhizae, disease strikes and the mycorrhizae are killed. Which of the following would be impacted? Check all that apply.
_____ the water supply to the plant _____ the availability of mineral nutrients to the plant _____ the binding of the soil and erosion _____ the supply of organic food to the plant
What is production efficiency?
A. The rate of photosynthetic fixation as a function of temperature. B. The percentage of energy assimilated by an organism that becomes new biomass. C. The amount of energy used by organisms at every node of a food web. D. Consumption of primary production by the second and third levels of a food web. E. The net energy gain to an ecosystem based on photosynthetic production.
Where do exocytic secretory vesicles originate?
a. endoplasmic reticulum b. plasma membrane c. the Golgi complex d. lysosomes e. microbodies
In the tryptophan operon, the repressor actively binds to the operator when:a
tryptophan binds to an allosteric site on the repressor protein, thereby activating it. b. tryptophan levels are low. c. lactose levels are low. d. there is a great need for proteins. e. allotryptophan levels are low.